Because identical twins, who share 100% of their genes, can differ in their sexual orientations, factors other than genetics must account for the differences.
Research suggests that our sexuality is determined in the womb and is dependent on the amount of male hormone we are exposed to or the way our individual bodies react to that hormone, with those exposed to higher levels of testosterone being more likely to be bisexual or homosexual.
Because of the link between hormone levels and difference in finger lengths, looking at someone's hands could provide a clue to their sexuality.
While you're probably all measuring your fingers now, we can't help but feel that a person's sexuality comes down to something a lot more profound and complex than the size of their fingers.
Imagine if having a finger bigger than the other means that you should completely determine your sexual orientation and who you are attracted to? Kinda ridiculous when you really sit down and think about it.
Also, the study has a very small research pool and doesn't even accommodate for people who identify as bisexual, pansexual or asexual. Sexuality is a spectrum, after all.
The publications of this study, which has been printed in the Archives of Sexual Behaviour, has created some discourse on Twitter, with most people calling it out for its obvious problems.